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The interior of the Hook-Up Truck features hand-painted wallpaper, special lighting and mirrors.

However, there’s no furniture inside, just a bar, a strap, and a bench – as well as everything for couples to ensure they have safe sex.

All aboard? Spy Emerson inside the truck which she'll be driving around San Francisco

It will cost strangers $75 for 30 minutes at festivals, or it can be hired for $150 (£90) for 30 minutes. For $2,500 (£1,500), parties can rent the Hook-Up Truck for five hours, which includes staff for hosting guests, and cleaning services.

As part of the project, Spy will be snapping the couples to ‘capture of soulfulness when strangers become intimate’.

She said: ‘I will be photographing our experience, and any willing volunteers who use the truck and want to be a part of the photo series.

Art project: Spy will be photographing willing couples before and after they use the Hook-Up Truck

‘The truck is like a giant piece of art too. The outside is bombed by prominent street artists, and inside, there is one small room concealed within the back of the box truck, disguised to be a pile of cardboard boxes.

‘The room interior is designed to be fancy and minimal both, with the focus on usability, and keeping it clean.

‘I plan to mount an exhibition of photos, film, and the truck itself at the end of the year.’

After a test run last month, the Hook-Up Truck is now set to tour festivals and ‘sex-positive events’ in San Francisco over the summer including Electric Daisy Carnival, Coachella as well as Miami Basel in December.

And Spy says she also has plans to build a truck for festivals across Europe, adding ‘that would be a dream’.